Question

An extension cord is used with an electric weed trimmer that has a resistance of 13.7 O. The extension cord is made of copper (resistivity 1.72 x 10-8 ohm m) wire that has a cross-sectional area of 1.20 x 10-6 m2. The combined length of the two wires in the extension cord is 85.6 m. (a) Determine the resistance of the extension cord. (b) The extension cord is plugged into a 120-V socket. What voltage is applied to the trimmer itself?